INVESTIGADORES
BERTERO Melisa Paola
artículos
Título:
Effect of Pyrolysis Temperature and Thermal Conditioning on the Coke-Forming Potential of Bio-oils
Autor/es:
MELISA BERTERO; GABRIELA DE LA PUENTE; ULISES SEDRAN
Revista:
ENERGY & FUELS (PRINT)
Editorial:
AMER CHEMICAL SOC
Referencias:
Año: 2011 vol. 25 p. 1267 - 1275
ISSN:
0887-0624
Resumen:
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Bio-oil from the pyrolysis of pine sawdust
was subjected to a thermal conditioning process aimed at inducing changes in
its composition and physicochemical properties. The objective was to facilitate
the co-processing of bio-oil together with conventional feedstocks in FCC. The
pyrolysis was performed at different conditions (heating ramp 15 ºC/min, final
temperatures from 300 to 650 ºC), yielding varying proportions of gases, tar,
char and bio-oil. The maximum bio-oil yield (43.7 wt%) was obtained at 550 ºC.
Bio-oil showed a high concentration of oxygenated compounds (about 48 wt%)
including acids, esthers, aldehydes, ketones, furans, alcohols, sugars, phenols
and ethers, together with hydrocarbons and close to 50 wt% of water. The
thermal treatments included different conditions (final temperatures from 350
to 550 ºC, and heating ramps from 8 to 12 ºC/min), and the most important
consequences were that the concentrations of compounds believed to be coke
precursors, such as phenols decreasesd significantly (between 30 and 50 %, and
particularly some phenolic ethers, up to 90 %), and high molecular weight
compounds (between 50 and 65 %). Some physicochemical properties in the bio-oil
changed positively, the CCR decreasing from 4.8 wt% to about 1.5 wt%, and the
effective hydrogen index increasing by 30 %. Most of the carbon and the
hydrogen remained in the liquid phase after the thermal treatment, while about
40 % of the oxygen was removed. The by-products in the thermal process (tar,
gases and pyrolytic lignin), represented an overall yield of about 5 wt%, and
the overall yield of conditioned liquid was 38.7 wt% based on the sawdust raw
material.